Add client/server split and TTS app

Set up FastAPI server, vanilla UI, and deployment scripts for the TTS app, including DB/ffmpeg wiring and Apache config.

server/tts_service.py

@@ -0,0 +1,42 @@
+import os
+import subprocess
+import tempfile
+from pathlib import Path
+
+import pyttsx3
+
+
+def text_to_mp3(text: str, mp3_path: str) -> None:
+    if not text:
+        raise RuntimeError("텍스트가 비어 있습니다.")
+
+    mp3_target = Path(mp3_path)
+    mp3_target.parent.mkdir(parents=True, exist_ok=True)
+
+    engine = pyttsx3.init()
+    wav_fd, wav_path = tempfile.mkstemp(suffix=".wav")
+    os.close(wav_fd)
+
+    try:
+        # pyttsx3로 wav 생성 후 ffmpeg로 mp3 변환
+        engine.save_to_file(text, wav_path)
+        engine.runAndWait()
+
+        subprocess.run(
+            ["ffmpeg", "-y", "-i", wav_path, str(mp3_target)],
+            check=True,
+            stdout=subprocess.DEVNULL,
+            stderr=subprocess.DEVNULL,
+        )
+
+        if not mp3_target.exists():
+            raise RuntimeError("mp3 파일 생성에 실패했습니다.")
+    except subprocess.CalledProcessError as exc:
+        raise RuntimeError("ffmpeg 변환에 실패했습니다.") from exc
+    except OSError as exc:
+        raise RuntimeError("파일 생성 권한 또는 경로 오류입니다.") from exc
+    finally:
+        try:
+            os.remove(wav_path)
+        except OSError:
+            pass